You need to get the installation folder uploaded again. And remove the configuration.php from the root. This way the system will think it needs to install again. When you are at step 1 of thewebinstaller check the "Drop Existing Tables" so existing data will be removed from you database and you will get a fresh installation.

Thanks Hwelvaar for these contributions. Something small I need to know. Under which folder in the web hosting do you place the installation folder? I tried uploading the folder but it was not picking the files in the folder then I compressed the folder using rar and directed it to be uploaded to public_html folder, when I tried to extract I got an error saying "file manager does not support extracting this type of file" now this is were I am stuck. I have already deleted configuration.php file.